The AllPlanes
macro returns a value with all bits set to 1 suitable for use in a plane
argument to a procedure.

The BlackPixel macro returns the black pixel
value for the specified screen.

The WhitePixel macro returns the white
pixel value for the specified screen.

The ConnectionNumber macro returns
a connection number for the specified display.

The DefaultColormap macro
returns the default colormap ID for allocation on the specified screen.

The DefaultDepth macro returns the depth (number of planes) of the default
root window for the specified screen.

The XListDepths function returns
the array of depths that are available on the specified screen. If the
specified screen_number is valid and sufficient memory for the array can
be allocated, XListDepths sets count_return to the number of available
depths. Otherwise, it does not set count_return and returns NULL. To release
the memory allocated for the array of depths, use XFree.

The DefaultGC
macro returns the default GC for the root window of the specified screen.

The DefaultRootWindow macro returns the root window for the default screen.

The DefaultScreenOfDisplay macro returns the default screen of the specified
display.

The DefaultScreen macro returns the default screen number referenced
in the XOpenDisplay routine.

The DefaultVisual macro returns the default
visual type for the specified screen.

The DisplayCells macro returns the
number of entries in the default colormap.

The DisplayPlanes macro returns
the depth of the root window of the specified screen.

The DisplayString
macro returns the string that was passed to XOpenDisplay when the current
display was opened.

The XMaxRequestSize function returns the maximum request
size (in 4-byte units) supported by the server without using an extended-length
protocol encoding. Single protocol requests to the server can be no larger
than this size unless an extended-length protocol encoding is supported
by the server. The protocol guarantees the size to be no smaller than 4096
units (16384 bytes). Xlib automatically breaks data up into multiple protocol
requests as necessary for the following functions: XDrawPoints, XDrawRectangles,
XDrawSegments, XFillArcs, XFillRectangles, and XPutImage.

The
XExtendedMaxRequestSize function returns zero if the specified display
does not support an extended-length protocol encoding; otherwise, it returns
the maximum request size (in 4-byte units) supported by the server using
the extended-length encoding. The Xlib functions XDrawLines, XDrawArcs,
XFillPolygon, XChangeProperty, XSetClipRectangles, and XSetRegion
will use the extended-length encoding as necessary, if supported by the
server. Use of the extended-length encoding in other Xlib functions (for
example, XDrawPoints, XDrawRectangles, XDrawSegments, XFillArcs,
XFillRectangles, XPutImage) is permitted but not required; an Xlib
implementation may choose to split the data across multiple smaller requests
instead.

The LastKnownRequestProcessed macro extracts the full serial
number of the last request known by Xlib to have been processed by the
X server.

The NextRequest macro extracts the full serial number that is
to be used for the next request.

The ProtocolVersion macro returns the
major version number (11) of the X protocol associated with the connected
display.

The ProtocolRevision macro returns the minor protocol revision
number of the X server.

The QLength macro returns the length of the event
queue for the connected display.

The RootWindow macro returns the root
window.

The ScreenCount macro returns the number of available screens.

The ScreenOfDisplay macro returns a pointer to the screen of the specified
display.

The ServerVendor macro returns a pointer to a null-terminated
string that provides some identification of the owner of the X server implementation.

The VendorRelease macro returns a number related to a vendor's release
of the X server.